cicd: run on every pull request, but only deploy on testing

.forgejo/workflows/testing.yml

@@ -2,6 +2,8 @@ on:
   push:
     branches:
       - testing
+  pull_request:
+
 jobs:
   test:
     runs-on: docker
@@ -23,6 +25,7 @@ jobs:
   deploy:
     needs: [test]
     runs-on: docker
+    if: github.ref == 'refs/heads/testing'
     steps:
       - uses: actions/checkout@v4
       - name: Install ansible